Rockwell RCV144ACx, Command Reference Manual

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AT Command Reference Manual
1048 3-3
Cn - Carrier Control
This command is included for compatibility only, and has no effect other than returning a result code. The only valid
parameter is 1.
Result Codes:
OK n = 1.
ERROR Otherwise.
Dn - Dial
This command directs the modem to go on-line, dial according to the string entered and attempt to establish a connection. If
no dial string is supplied, the modem will go on-line and attempt the handshake in originate mode. In W-class models, the
action of going off-hook is affected by the status of the Line Current Sense input, if line current sensing is enabled, and by
the blacklist and delayed list. NOTE: If the ATD command is issued before the S1 register has cleared, the modem will
respond with the NO CARRIER result code.
If +FCLASS=0 is selected, the modem will behave as a data modem and will attempt to connect to another data modem.
The modem will have up to the period of time specified by register S6 or S7 to wait for carrier and complete the handshake.
If this time expires before the modem can complete the handshake, the modem will go on-hook with the NO CARRIER
response. This command will be aborted in progress upon receipt of any DTE character before completion of the handshake.
If +FCLASS=1 or 2 is selected, the modem will behave as a facsimile modem and attempt to connect to a facsimile machine
(or modem) by entering the HDLC V.21 channel 2 receive state (as if +FRH=3 had been issued). This command will be
aborted upon receipt of any DTE character if the modem has not finished dialing. In this case, the modem will go on-hook
and return to command mode after displaying the NO CARRIER message. If the modem has finished dialing, it proceeds as
if the +FRH=3 command has been issued. (Refer to the +FRH command to determine how the modem behaves following
this stage.)
Dial Modifiers. The valid dial string parameters are described below. Punctuation characters may be used for clarity, with
parentheses, hyphen, and spaces being ignored.
0-9 DTMF digits 0 to 9.
* The 'star' digit (tone dialing only).
# The 'gate' digit (tone dialing only).
A-D DTMF digits A, B, C, and D. Some countries may prohibit sending of these digits during dialing.
L Re-dial last number: the modem will re-dial the last valid telephone number. The L must be
immediately after the D with all the following characters ignored).
P Select pulse dialing: pulse dial the numbers that follow until a "T" is encountered. Affects current and
subsequent dialing. Some countries prevent changing dialing modes after the first digit is dialed.
T Select tone dialing: tone dial the numbers that follow until a "P" is encountered. Affects current and
subsequent dialing. Some countries prevent changing dialing modes after the first digit is dialed.
R This command will be accepted, but not acted on.
S=n Dial the number stored in the directory (n = 0 to 3). (See &Z.)
! Flash: the modem will go on-hook for a time defined by the value of S29. Country requirements may
limit the time imposed.
W Wait for dial tone: the modem will wait for dial tone before dialing the digits following "W". If dial tone
is not detected within the time specified by S7 (US) or S6 (W-class), the modem will abort the rest
of the sequence, return on-hook, and generate an error message.